I have finally had time to build a reflux still which is one of the three allowable units on my Alcohol Fuel Plant permit. The performance improvement over my old pot still is amazing. I have standardized my performance testing by using a constant 1500ml of alcohol/water mix containing 75ml of pure alcohol. I settled on this 5% mixture because it is the best I have been able to do using a corn mash with no added sugar. Remember, we are making fuel so the cost of refined sugar is out of the question. Here is the data from my last run:
The initial alcohol potency is over twice that of my old pot still. For fuel production I would never go back. It does show, however, that I am still not at the point of being able to create a flammable product in a single step. I suspect that with more refluxing I will be able to keep increasing the potency of my single distilled product.